I'm not sure if ET is here or not.  I know Project Bluebeam wants Us to think so...  I do ponder whether They have been here all along, moving the show to Their goals - that show on the cave wall (Our screens, in the "news").

The Terra Papers, by Robert Morning Sky, suggest that Humanity was created as a worker class so the ET's did not have to do the labor mining...  If You want to read the Papers, I have an introduction here that offers what I know, along with a glossary, and a link to the Papers themselves:
 
The Terra Papers:  https://tapyoureit.boards.net/thread/167/terra-papers